//
//  ESTextField.m
//  Estate
//
//  Created by heyong on 2016/11/8.
//  Copyright © 2016年 ttsx. All rights reserved.
//

#import "ESTextField.h"

@implementation ESTextField

/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
    // Drawing code
}
*/

-(void)awakeFromNib
{
    [super awakeFromNib];
    [self addTarget:self action:@selector(textFieldDidChange:) forControlEvents:UIControlEventEditingChanged];
}

-(void)textFiledEditChanged:(NSNotification*)obj{
    UITextField *textField = (UITextField *)obj.object;
    //过滤掉系统表情
    //    UITextView * textView;
    //
    //    NSRange textRange = [textView selectedRange];
    //    [textView setText:[self disable_emoji:[textView text]]];
    //    [textView setSelectedRange:textRange];
    
    NSString *toBeString = textField.text;
    
//    NSLog(@"-----toBeString  1  ----%@",toBeString);
    
    BOOL isEmoj = [self stringContainsEmoji:toBeString];
    NSString * _showStr;
    
    toBeString = [self disable_emoji:toBeString];
    
//    NSLog(@"-----toBeString   2  -----%@",toBeString);
    
    if (isEmoj) {
        if ([_showStr length]) {
            textField.text = _showStr;
        }else{
            textField.text = toBeString;
        }
    }
}

//判断NSString字符串是否包含emoji表情
- (BOOL)stringContainsEmoji:(NSString *)string
{
    __block BOOL returnValue =NO;
    [string enumerateSubstringsInRange:NSMakeRange(0, [string length]) options:NSStringEnumerationByComposedCharacterSequences usingBlock:^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop) {
        const unichar hs = [substring characterAtIndex:0];
        // surrogate pair
        if (0xd800) {
            if (0xd800 <= hs && hs <= 0xdbff) {
                if (substring.length > 1) {
                    const unichar ls = [substring characterAtIndex:1];
                    const int uc = ((hs - 0xd800) * 0x400) + (ls - 0xdc00) + 0x10000;
                    if (0x1d000 <= uc && uc <= 0x1f77f) {
                        returnValue =YES;
                    }
                }
            }else if (substring.length > 1) {
                const unichar ls = [substring characterAtIndex:1];
                if (ls == 0x20e3) {
                    returnValue =YES;
                }
            }else {
                // non surrogate
                if (0x2100 <= hs && hs <= 0x27ff) {
                    returnValue =YES;
                }else if (0x2B05 <= hs && hs <= 0x2b07) {
                    returnValue =YES;
                }else if (0x2934 <= hs && hs <= 0x2935) {
                    returnValue =YES;
                }else if (0x3297 <= hs && hs <= 0x3299) {
                    returnValue =YES;
                }else if (hs == 0xa9 || hs == 0xae || hs == 0x303d || hs == 0x3030 || hs == 0x2b55 || hs == 0x2b1c || hs == 0x2b1b || hs == 0x2b50) {
                    returnValue =YES;
                }
            }
        }
    }];
    return returnValue;
}

#pragma Mark   ---  过滤表情
- (NSString *)disable_emoji:(NSString *)text
{
    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"[^\\u0020-\\u007E\\u00A0-\\u00BE\\u2E80-\\uA4CF\\uF900-\\uFAFF\\uFE30-\\uFE4F\\uFF00-\\uFFEF\\u0080-\\u009F\\u2000-\\u201f\r\n]" options:NSRegularExpressionCaseInsensitive error:nil];
    NSString *modifiedString = [regex stringByReplacingMatchesInString:text
                                                               options:0
                                                                 range:NSMakeRange(0, [text length])
                                                          withTemplate:@""];
    return modifiedString;
}

// 字符限制
- (void)textFieldDidChange:(UITextField *)textField
{
    if (textField == self) {
        if (textField.text.length > 1000) {
            textField.text = [textField.text substringToIndex:1000];
        }
    }
}



@end
